Somewhere along this line? sudo sh -c "echo 1 > /sys/kernel/debug/tracing/options/latency-format" sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_enabled" sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_on" sudo sh -c "echo function > /sys/kernel/debug/tracing/current_tracer" ###Do whatever you need to do to trigger the bug ###Save the trace log: sudo sh -c "bzip2 -c /sys/kernel/debug/tracing/trace > /tmp/trace.bz2" But take note that this is possible only if FTRACE is enabled: Mine Ubuntu 10.10's config (default): /boot/config-2.6.35-22-generic:CONFIG_HAVE_FTRACE_NMI_ENTER=y /boot/config-2.6.35-22-generic:CONFIG_HAVE_DYNAMIC_FTRACE=y /boot/config-2.6.35-22-generic:CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y /boot/config-2.6.35-22-generic:CONFIG_FTRACE_NMI_ENTER=y /boot/config-2.6.35-22-generic:CONFIG_FTRACE=y /boot/config-2.6.35-22-generic:CONFIG_FTRACE_SYSCALLS=y /boot/config-2.6.35-22-generic:CONFIG_DYNAMIC_FTRACE=y /boot/config-2.6.35-22-generic:CONFIG_FTRACE_MCOUNT_RECORD=y /boot/config-2.6.35-22-generic:# CONFIG_FTRACE_STARTUP_TEST is not set On Tue, Oct 4, 2011 at 2:24 PM, Amit Nagal <helloin.amit@gmail.com> wrote:

Hi ,

i have a gap of 2-3 ms between 2 usb interrupts callback .

i want to know which kernel/user threads execute in the gap of 2-3 ms .

basically i want to log schedule history between 2 usb interrupts callback .

which data structures / functions can i use to furnish schedule logging history for this case ?

Regards Amit Nagal

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